Sewing-machine



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JQW. LINGLBY.

SEWING MACHINE.

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' J. W. LINGLEY.

SEWING MACHINE.

No. 534,835. Patented `Peb. 26, 1895.

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PATENT Ormes,

J OI-IN W. LIN GLEY, OF WOLLASTON, MASSACHUSETTS, ASSIGNOR TO THEMERRICK SEWING MACHINE COMPANY, OF PORTLAND, MAINE.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 534,835, dated February26, 1895.

Application nea naar .12, 1 894.

To all whom it may concern:

Be it known that I, JOHN W. LINGLEY, of Wollaston, in the county ofNorfolk and State of Massachusetts, have invented certain new and usefulImprovements in Sewing -Machines, of which the following is aspecification.

This invention relates to that class of sewing machines especiallydesigned for sewing leather, as uppers of boots and shoes, and employinga reciprocating presser-foot, and a looper having a compound movement.v

One object of the present invention is to provide improved means forelevating the presser-foot which will obviate the objectionable noiseheretofore incident to this operation in this class of machines, andwhich will permit ready adjustment to determine the extent of movementof the presser-foot, and adjustment to determine the time of thepresserfoots action.

Another object of the invention is to provide improved means forimparting the coming drawings forming part thereof.

Of said drawings-Figure 1 shows a front elevation of a sufficientportion of a machine having the improvements to illustrate the same.Fig. 2 shows a side elevation of the same. Fig. 3 shows a top plan view.Figs. 4, 5, and 6 are sectional views illustrating the movements of thelooper in the formation of a stitch.

It will not be necessary to enter into a detailed description of thoseparts of the machine not` affected by the present invention, and asimple enumeration of some of them will be sufficient.

The letter, c, designates the awl; b, the

Serial No. 503.305. (No model.)

thread-guide; c, the needle; c', the needle driving shaft, and et theawl-driving shaft.

The presser-foot, d, has its bars, d', in a vertical slide-way, asusual, and is here shown as offset at its upper end, (see dotted linesin Fig. 2) to form a horizontal shoulder, d2. A dat spring, d4, bears onthe upper end of the bar over the said shoulder, and impels thepresser-foot downward.

A pair of spread arms, c, and c', are pivoted on a stud, e2, fastened ina fixed bracket, e3, and are connected together by a screw, e4, whoseturning varies the distance of the arms apart, the said armsconstituting a lever.v The lowerarm, e, extends under the shoulder, d2,and the upper arm, e', extends over the shaft, a. The latter carries acam,f, to act on said arm, e', and elevate the presser-foot by the arm,c, acting against the shoulder, d2. It will be seen that thisconstruction obviates the noise caused by the striking of an arm on theawl bar against an abutment on the presserfoot bar, the arrangement. nowin vogue.

The screw, e4, provides very convenient means for regulating the extentof movement of the presser-foot. The cam,f, is adjustable to change itstime, said cam being capable of turning on the shaft, d', and carrying ascrew, f', which extends through a slot, f2, in the awl-driving crank,a2. Check screws, f3, entered in opposite sides of said crank abut thescrew, f. By this arrangement the time of elevating the presser-foot maybe regulated.

The looper, g, is fastened to an arm, g', which has a straightlongitudinal slot, g2, receiving a pivot, g3, supported by the vibratingneedle-frame, c2. A disk, g4, afxed on the shaft, c', has a cam groove,g5, which receives a roller on the lower end of the arm, g', andproduces lateral vibrations of the looper. The said disk, g4, is formedwith another cam-groove, QG, which receives a roller on a pivotedhorizontal arm Q7, whose free end is connected by a link, g8, with thearm,

g. Through these connections the looper receives vertical reciprocation.

The loopers movement is best illustrated in Figs. 4, 5, and 6. When theloop, 2, has been brought down by the needle the looper is movedlaterally to the right and into the loop which it spreads. Then as theneedle ascends the looper also ascends, holding the loop While theneedle goes up through the Work and comes down with the next loop, 3;and the looper moves laterally out of the loop and out from in front ofthe needle as the latter descends, so that it is entirely withdrawn fromthe loop before the latter is taken up, and hence, the thread is notsubjected to strain to cast it off the looper as heretofore. Afterhaving thus moved laterally the looper descends to its first position intime to enter the new loop, 3.

It will be seen that by the means shown and described an accuratemovement of the looper is assured.

A cam for vibrating the looper in addition to the cam for verticallyreciprocating it isa more reliable arrangement than that of an angularslot in the looper arm and a single cam for operating the latter, andhas the advantage of providing for lateral movement distinct from thevertical movement and vice versa, whereas with the angular slot onemovement is produced by the other, and the lateral and verticalmovements are not distinct but the motion of the looper is in an obliquedirection and the loop is cast off the looper While the latter is infront of the needle, and therefore, the thread has to be put understrain to force it off the end of the looper.

Another advantage of a distinct lateral movement of the looper is thatits end can be formed to extend on a greater angle to more securely holdthe loop while in the same, and no auxiliary means for holding on theloop are needed, as heretofore.

I-Iaving thus explained the nature of the invention and described a wayof constructing' and using the same, though without attempting to setforth all of the forms in which it may be made or all of the modes ofits use, it is declared that what is claimed isl. In a sewing machinethe combination of a looper, an arm supporting the same and having astraight slot embracing a pivot-pin, on which said arm vibrates a diskon the needle driving-shaft having a pair of cam-grooves, one receivinga roller on said arm and adapted to produce lateral vibration of thesame, a horizontal pivoted arm carrying a roller in engagement with theother cam-groove, and a link connecting said arm with the looperarmwhereby vertical reciprocations of the latter are produced,

2. In a sewing machine the combination of a vertically movablepresserfoot and bar, a pairof concentrical-ly pivoted arms connectedtogether by an adjustment screw, oneof said arms extending :under ashoulder on the presser-foot bar, and a cam on the awl driving-shaftarranged to act against the other arm to elevate the presser-foot.

3. In a sewing machine the combination of a vertically movablepresser-foot and bar, a lever for elevating the same, a cam on theawl-shat`t co-acting with said lever and movable on said shaft, aslottedaWl-driving crank on the shaft and receiving a screw fastened in thecam, and carrying check-screws to bear against said screw, an awloperatively connected with said crank, and a needle and needlereciprocating means.

In testimony whereof I have signed my name to this specification, in thepresence of two subscribing witnesses, this 28th day of February, A. D.1894:.

JOHN V. LINGLEY.

Witnesses:

C. F. BROWN, F. P. DAvIs.

